5 files changed, 810 insertions, 0 deletions

diff --git a/server/controllers/activitypub/client.ts b/server/controllers/activitypub/client.ts
new file mode 100644
index 000000000..28d08b3f4
--- /dev/null
+++ b/server/controllers/activitypub/client.ts
@@ -0,0 +1,65 @@
+// Intercept ActivityPub client requests
+import * as express from 'express'
+
+import { database as db } from '../../initializers'
+import { executeIfActivityPub, localAccountValidator } from '../../middlewares'
+import { pageToStartAndCount } from '../../helpers'
+import { AccountInstance } from '../../models'
+import { activityPubCollectionPagination } from '../../helpers/activitypub'
+import { ACTIVITY_PUB } from '../../initializers/constants'
+import { asyncMiddleware } from '../../middlewares/async'
+
+const activityPubClientRouter = express.Router()
+
+activityPubClientRouter.get('/account/:name',
+  executeIfActivityPub(localAccountValidator),
+  executeIfActivityPub(asyncMiddleware(accountController))
+)
+
+activityPubClientRouter.get('/account/:name/followers',
+  executeIfActivityPub(localAccountValidator),
+  executeIfActivityPub(asyncMiddleware(accountFollowersController))
+)
+
+activityPubClientRouter.get('/account/:name/following',
+  executeIfActivityPub(localAccountValidator),
+  executeIfActivityPub(asyncMiddleware(accountFollowingController))
+)
+
+// ---------------------------------------------------------------------------
+
+export {
+  activityPubClientRouter
+}
+
+// ---------------------------------------------------------------------------
+
+async function accountController (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const account: AccountInstance = res.locals.account
+
+  return res.json(account.toActivityPubObject()).end()
+}
+
+async function accountFollowersController (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const account: AccountInstance = res.locals.account
+
+  const page = req.params.page || 1
+  const { start, count } = pageToStartAndCount(page, ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE)
+
+  const result = await db.Account.listFollowerUrlsForApi(account.name, start, count)
+  const activityPubResult = activityPubCollectionPagination(req.url, page, result)
+
+  return res.json(activityPubResult)
+}
+
+async function accountFollowingController (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const account: AccountInstance = res.locals.account
+
+  const page = req.params.page || 1
+  const { start, count } = pageToStartAndCount(page, ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE)
+
+  const result = await db.Account.listFollowingUrlsForApi(account.name, start, count)
+  const activityPubResult = activityPubCollectionPagination(req.url, page, result)
+
+  return res.json(activityPubResult)
+}
diff --git a/server/controllers/activitypub/inbox.ts b/server/controllers/activitypub/inbox.ts
new file mode 100644
index 000000000..79d989c2c
--- /dev/null
+++ b/server/controllers/activitypub/inbox.ts
@@ -0,0 +1,72 @@
+import * as express from 'express'
+
+import {
+  processCreateActivity,
+  processUpdateActivity,
+  processFlagActivity
+} from '../../lib'
+import {
+  Activity,
+  ActivityType,
+  RootActivity,
+  ActivityPubCollection,
+  ActivityPubOrderedCollection
+} from '../../../shared'
+import {
+  signatureValidator,
+  checkSignature,
+  asyncMiddleware
+} from '../../middlewares'
+import { logger } from '../../helpers'
+
+const processActivity: { [ P in ActivityType ]: (activity: Activity) => Promise<any> } = {
+  Create: processCreateActivity,
+  Update: processUpdateActivity,
+  Flag: processFlagActivity
+}
+
+const inboxRouter = express.Router()
+
+inboxRouter.post('/',
+  signatureValidator,
+  asyncMiddleware(checkSignature),
+  // inboxValidator,
+  asyncMiddleware(inboxController)
+)
+
+// ---------------------------------------------------------------------------
+
+export {
+  inboxRouter
+}
+
+// ---------------------------------------------------------------------------
+
+async function inboxController (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const rootActivity: RootActivity = req.body
+  let activities: Activity[] = []
+
+  if ([ 'Collection', 'CollectionPage' ].indexOf(rootActivity.type) !== -1) {
+    activities = (rootActivity as ActivityPubCollection).items
+  } else if ([ 'OrderedCollection', 'OrderedCollectionPage' ].indexOf(rootActivity.type) !== -1) {
+    activities = (rootActivity as ActivityPubOrderedCollection).orderedItems
+  } else {
+    activities = [ rootActivity as Activity ]
+  }
+
+  await processActivities(activities)
+
+  res.status(204).end()
+}
+
+async function processActivities (activities: Activity[]) {
+  for (const activity of activities) {
+    const activityProcessor = processActivity[activity.type]
+    if (activityProcessor === undefined) {
+      logger.warn('Unknown activity type %s.', activity.type, { activityId: activity.id })
+      continue
+    }
+
+    await activityProcessor(activity)
+  }
+}
diff --git a/server/controllers/activitypub/index.ts b/server/controllers/activitypub/index.ts
new file mode 100644
index 000000000..7a4602b37
--- /dev/null
+++ b/server/controllers/activitypub/index.ts
@@ -0,0 +1,15 @@
+import * as express from 'express'
+
+import { badRequest } from '../../helpers'
+import { inboxRouter } from './inbox'
+
+const remoteRouter = express.Router()
+
+remoteRouter.use('/inbox', inboxRouter)
+remoteRouter.use('/*', badRequest)
+
+// ---------------------------------------------------------------------------
+
+export {
+  remoteRouter
+}
diff --git a/server/controllers/activitypub/pods.ts b/server/controllers/activitypub/pods.ts
new file mode 100644
index 000000000..326eb61ac
--- /dev/null
+++ b/server/controllers/activitypub/pods.ts
@@ -0,0 +1,69 @@
+import * as express from 'express'
+
+import { database as db } from '../../../initializers/database'
+import {
+  checkSignature,
+  signatureValidator,
+  setBodyHostPort,
+  remotePodsAddValidator,
+  asyncMiddleware
+} from '../../../middlewares'
+import { sendOwnedDataToPod } from '../../../lib'
+import { getMyPublicCert, getFormattedObjects } from '../../../helpers'
+import { CONFIG } from '../../../initializers'
+import { PodInstance } from '../../../models'
+import { PodSignature, Pod as FormattedPod } from '../../../../shared'
+
+const remotePodsRouter = express.Router()
+
+remotePodsRouter.post('/remove',
+  signatureValidator,
+  checkSignature,
+  asyncMiddleware(removePods)
+)
+
+remotePodsRouter.post('/list',
+  asyncMiddleware(remotePodsList)
+)
+
+remotePodsRouter.post('/add',
+  setBodyHostPort, // We need to modify the host before running the validator!
+  remotePodsAddValidator,
+  asyncMiddleware(addPods)
+)
+
+// ---------------------------------------------------------------------------
+
+export {
+  remotePodsRouter
+}
+
+// ---------------------------------------------------------------------------
+
+async function addPods (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const information = req.body
+
+  const pod = db.Pod.build(information)
+  const podCreated = await pod.save()
+
+  await sendOwnedDataToPod(podCreated.id)
+
+  const cert = await getMyPublicCert()
+  return res.json({ cert, email: CONFIG.ADMIN.EMAIL })
+}
+
+async function remotePodsList (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const pods = await db.Pod.list()
+
+  return res.json(getFormattedObjects<FormattedPod, PodInstance>(pods, pods.length))
+}
+
+async function removePods (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const signature: PodSignature = req.body.signature
+  const host = signature.host
+
+  const pod = await db.Pod.loadByHost(host)
+  await pod.destroy()
+
+  return res.type('json').status(204).end()
+}
diff --git a/server/controllers/activitypub/videos.ts b/server/controllers/activitypub/videos.ts
new file mode 100644
index 000000000..cba47f0a1
--- /dev/null
+++ b/server/controllers/activitypub/videos.ts
@@ -0,0 +1,589 @@
+import * as express from 'express'
+import * as Bluebird from 'bluebird'
+import * as Sequelize from 'sequelize'
+
+import { database as db } from '../../../initializers/database'
+import {
+  REQUEST_ENDPOINT_ACTIONS,
+  REQUEST_ENDPOINTS,
+  REQUEST_VIDEO_EVENT_TYPES,
+  REQUEST_VIDEO_QADU_TYPES
+} from '../../../initializers'
+import {
+  checkSignature,
+  signatureValidator,
+  remoteVideosValidator,
+  remoteQaduVideosValidator,
+  remoteEventsVideosValidator
+} from '../../../middlewares'
+import { logger, retryTransactionWrapper, resetSequelizeInstance } from '../../../helpers'
+import { quickAndDirtyUpdatesVideoToFriends, fetchVideoChannelByHostAndUUID } from '../../../lib'
+import { PodInstance, VideoFileInstance } from '../../../models'
+import {
+  RemoteVideoRequest,
+  RemoteVideoCreateData,
+  RemoteVideoUpdateData,
+  RemoteVideoRemoveData,
+  RemoteVideoReportAbuseData,
+  RemoteQaduVideoRequest,
+  RemoteQaduVideoData,
+  RemoteVideoEventRequest,
+  RemoteVideoEventData,
+  RemoteVideoChannelCreateData,
+  RemoteVideoChannelUpdateData,
+  RemoteVideoChannelRemoveData,
+  RemoteVideoAuthorRemoveData,
+  RemoteVideoAuthorCreateData
+} from '../../../../shared'
+import { VideoInstance } from '../../../models/video/video-interface'
+
+const ENDPOINT_ACTIONS = REQUEST_ENDPOINT_ACTIONS[REQUEST_ENDPOINTS.VIDEOS]
+
+// Functions to call when processing a remote request
+// FIXME: use RemoteVideoRequestType as id type
+const functionsHash: { [ id: string ]: (...args) => Promise<any> } = {}
+functionsHash[ENDPOINT_ACTIONS.ADD_VIDEO] = addRemoteVideoRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.UPDATE_VIDEO] = updateRemoteVideoRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.REMOVE_VIDEO] = removeRemoteVideoRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.ADD_CHANNEL] = addRemoteVideoChannelRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.UPDATE_CHANNEL] = updateRemoteVideoChannelRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.REMOVE_CHANNEL] = removeRemoteVideoChannelRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.REPORT_ABUSE] = reportAbuseRemoteVideoRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.ADD_AUTHOR] = addRemoteVideoAuthorRetryWrapper
+functionsHash[ENDPOINT_ACTIONS.REMOVE_AUTHOR] = removeRemoteVideoAuthorRetryWrapper
+
+const remoteVideosRouter = express.Router()
+
+remoteVideosRouter.post('/',
+  signatureValidator,
+  checkSignature,
+  remoteVideosValidator,
+  remoteVideos
+)
+
+remoteVideosRouter.post('/qadu',
+  signatureValidator,
+  checkSignature,
+  remoteQaduVideosValidator,
+  remoteVideosQadu
+)
+
+remoteVideosRouter.post('/events',
+  signatureValidator,
+  checkSignature,
+  remoteEventsVideosValidator,
+  remoteVideosEvents
+)
+
+// ---------------------------------------------------------------------------
+
+export {
+  remoteVideosRouter
+}
+
+// ---------------------------------------------------------------------------
+
+function remoteVideos (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const requests: RemoteVideoRequest[] = req.body.data
+  const fromPod = res.locals.secure.pod
+
+  // We need to process in the same order to keep consistency
+  Bluebird.each(requests, request => {
+    const data = request.data
+
+    // Get the function we need to call in order to process the request
+    const fun = functionsHash[request.type]
+    if (fun === undefined) {
+      logger.error('Unknown remote request type %s.', request.type)
+      return
+    }
+
+    return fun.call(this, data, fromPod)
+  })
+  .catch(err => logger.error('Error managing remote videos.', err))
+
+  // Don't block the other pod
+  return res.type('json').status(204).end()
+}
+
+function remoteVideosQadu (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const requests: RemoteQaduVideoRequest[] = req.body.data
+  const fromPod = res.locals.secure.pod
+
+  Bluebird.each(requests, request => {
+    const videoData = request.data
+
+    return quickAndDirtyUpdateVideoRetryWrapper(videoData, fromPod)
+  })
+  .catch(err => logger.error('Error managing remote videos.', err))
+
+  return res.type('json').status(204).end()
+}
+
+function remoteVideosEvents (req: express.Request, res: express.Response, next: express.NextFunction) {
+  const requests: RemoteVideoEventRequest[] = req.body.data
+  const fromPod = res.locals.secure.pod
+
+  Bluebird.each(requests, request => {
+    const eventData = request.data
+
+    return processVideosEventsRetryWrapper(eventData, fromPod)
+  })
+  .catch(err => logger.error('Error managing remote videos.', err))
+
+  return res.type('json').status(204).end()
+}
+
+async function processVideosEventsRetryWrapper (eventData: RemoteVideoEventData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ eventData, fromPod ],
+    errorMessage: 'Cannot process videos events with many retries.'
+  }
+
+  await retryTransactionWrapper(processVideosEvents, options)
+}
+
+async function processVideosEvents (eventData: RemoteVideoEventData, fromPod: PodInstance) {
+  await db.sequelize.transaction(async t => {
+    const sequelizeOptions = { transaction: t }
+    const videoInstance = await fetchLocalVideoByUUID(eventData.uuid, t)
+
+    let columnToUpdate
+    let qaduType
+
+    switch (eventData.eventType) {
+    case REQUEST_VIDEO_EVENT_TYPES.VIEWS:
+      columnToUpdate = 'views'
+      qaduType = REQUEST_VIDEO_QADU_TYPES.VIEWS
+      break
+
+    case REQUEST_VIDEO_EVENT_TYPES.LIKES:
+      columnToUpdate = 'likes'
+      qaduType = REQUEST_VIDEO_QADU_TYPES.LIKES
+      break
+
+    case REQUEST_VIDEO_EVENT_TYPES.DISLIKES:
+      columnToUpdate = 'dislikes'
+      qaduType = REQUEST_VIDEO_QADU_TYPES.DISLIKES
+      break
+
+    default:
+      throw new Error('Unknown video event type.')
+    }
+
+    const query = {}
+    query[columnToUpdate] = eventData.count
+
+    await videoInstance.increment(query, sequelizeOptions)
+
+    const qadusParams = [
+      {
+        videoId: videoInstance.id,
+        type: qaduType
+      }
+    ]
+    await quickAndDirtyUpdatesVideoToFriends(qadusParams, t)
+  })
+
+  logger.info('Remote video event processed for video with uuid %s.', eventData.uuid)
+}
+
+async function quickAndDirtyUpdateVideoRetryWrapper (videoData: RemoteQaduVideoData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ videoData, fromPod ],
+    errorMessage: 'Cannot update quick and dirty the remote video with many retries.'
+  }
+
+  await retryTransactionWrapper(quickAndDirtyUpdateVideo, options)
+}
+
+async function quickAndDirtyUpdateVideo (videoData: RemoteQaduVideoData, fromPod: PodInstance) {
+  let videoUUID = ''
+
+  await db.sequelize.transaction(async t => {
+    const videoInstance = await fetchVideoByHostAndUUID(fromPod.host, videoData.uuid, t)
+    const sequelizeOptions = { transaction: t }
+
+    videoUUID = videoInstance.uuid
+
+    if (videoData.views) {
+      videoInstance.set('views', videoData.views)
+    }
+
+    if (videoData.likes) {
+      videoInstance.set('likes', videoData.likes)
+    }
+
+    if (videoData.dislikes) {
+      videoInstance.set('dislikes', videoData.dislikes)
+    }
+
+    await videoInstance.save(sequelizeOptions)
+  })
+
+  logger.info('Remote video with uuid %s quick and dirty updated', videoUUID)
+}
+
+// Handle retries on fail
+async function addRemoteVideoRetryWrapper (videoToCreateData: RemoteVideoCreateData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ videoToCreateData, fromPod ],
+    errorMessage: 'Cannot insert the remote video with many retries.'
+  }
+
+  await retryTransactionWrapper(addRemoteVideo, options)
+}
+
+async function addRemoteVideo (videoToCreateData: RemoteVideoCreateData, fromPod: PodInstance) {
+  logger.debug('Adding remote video "%s".', videoToCreateData.uuid)
+
+  await db.sequelize.transaction(async t => {
+    const sequelizeOptions = {
+      transaction: t
+    }
+
+    const videoFromDatabase = await db.Video.loadByUUID(videoToCreateData.uuid)
+    if (videoFromDatabase) throw new Error('UUID already exists.')
+
+    const videoChannel = await db.VideoChannel.loadByHostAndUUID(fromPod.host, videoToCreateData.channelUUID, t)
+    if (!videoChannel) throw new Error('Video channel ' + videoToCreateData.channelUUID + ' not found.')
+
+    const tags = videoToCreateData.tags
+    const tagInstances = await db.Tag.findOrCreateTags(tags, t)
+
+    const videoData = {
+      name: videoToCreateData.name,
+      uuid: videoToCreateData.uuid,
+      category: videoToCreateData.category,
+      licence: videoToCreateData.licence,
+      language: videoToCreateData.language,
+      nsfw: videoToCreateData.nsfw,
+      description: videoToCreateData.truncatedDescription,
+      channelId: videoChannel.id,
+      duration: videoToCreateData.duration,
+      createdAt: videoToCreateData.createdAt,
+      // FIXME: updatedAt does not seems to be considered by Sequelize
+      updatedAt: videoToCreateData.updatedAt,
+      views: videoToCreateData.views,
+      likes: videoToCreateData.likes,
+      dislikes: videoToCreateData.dislikes,
+      remote: true,
+      privacy: videoToCreateData.privacy
+    }
+
+    const video = db.Video.build(videoData)
+    await db.Video.generateThumbnailFromData(video, videoToCreateData.thumbnailData)
+    const videoCreated = await video.save(sequelizeOptions)
+
+    const tasks = []
+    for (const fileData of videoToCreateData.files) {
+      const videoFileInstance = db.VideoFile.build({
+        extname: fileData.extname,
+        infoHash: fileData.infoHash,
+        resolution: fileData.resolution,
+        size: fileData.size,
+        videoId: videoCreated.id
+      })
+
+      tasks.push(videoFileInstance.save(sequelizeOptions))
+    }
+
+    await Promise.all(tasks)
+
+    await videoCreated.setTags(tagInstances, sequelizeOptions)
+  })
+
+  logger.info('Remote video with uuid %s inserted.', videoToCreateData.uuid)
+}
+
+// Handle retries on fail
+async function updateRemoteVideoRetryWrapper (videoAttributesToUpdate: RemoteVideoUpdateData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ videoAttributesToUpdate, fromPod ],
+    errorMessage: 'Cannot update the remote video with many retries'
+  }
+
+  await retryTransactionWrapper(updateRemoteVideo, options)
+}
+
+async function updateRemoteVideo (videoAttributesToUpdate: RemoteVideoUpdateData, fromPod: PodInstance) {
+  logger.debug('Updating remote video "%s".', videoAttributesToUpdate.uuid)
+  let videoInstance: VideoInstance
+  let videoFieldsSave: object
+
+  try {
+    await db.sequelize.transaction(async t => {
+      const sequelizeOptions = {
+        transaction: t
+      }
+
+      const videoInstance = await fetchVideoByHostAndUUID(fromPod.host, videoAttributesToUpdate.uuid, t)
+      videoFieldsSave = videoInstance.toJSON()
+      const tags = videoAttributesToUpdate.tags
+
+      const tagInstances = await db.Tag.findOrCreateTags(tags, t)
+
+      videoInstance.set('name', videoAttributesToUpdate.name)
+      videoInstance.set('category', videoAttributesToUpdate.category)
+      videoInstance.set('licence', videoAttributesToUpdate.licence)
+      videoInstance.set('language', videoAttributesToUpdate.language)
+      videoInstance.set('nsfw', videoAttributesToUpdate.nsfw)
+      videoInstance.set('description', videoAttributesToUpdate.truncatedDescription)
+      videoInstance.set('duration', videoAttributesToUpdate.duration)
+      videoInstance.set('createdAt', videoAttributesToUpdate.createdAt)
+      videoInstance.set('updatedAt', videoAttributesToUpdate.updatedAt)
+      videoInstance.set('views', videoAttributesToUpdate.views)
+      videoInstance.set('likes', videoAttributesToUpdate.likes)
+      videoInstance.set('dislikes', videoAttributesToUpdate.dislikes)
+      videoInstance.set('privacy', videoAttributesToUpdate.privacy)
+
+      await videoInstance.save(sequelizeOptions)
+
+      // Remove old video files
+      const videoFileDestroyTasks: Bluebird<void>[] = []
+      for (const videoFile of videoInstance.VideoFiles) {
+        videoFileDestroyTasks.push(videoFile.destroy(sequelizeOptions))
+      }
+      await Promise.all(videoFileDestroyTasks)
+
+      const videoFileCreateTasks: Bluebird<VideoFileInstance>[] = []
+      for (const fileData of videoAttributesToUpdate.files) {
+        const videoFileInstance = db.VideoFile.build({
+          extname: fileData.extname,
+          infoHash: fileData.infoHash,
+          resolution: fileData.resolution,
+          size: fileData.size,
+          videoId: videoInstance.id
+        })
+
+        videoFileCreateTasks.push(videoFileInstance.save(sequelizeOptions))
+      }
+
+      await Promise.all(videoFileCreateTasks)
+
+      await videoInstance.setTags(tagInstances, sequelizeOptions)
+    })
+
+    logger.info('Remote video with uuid %s updated', videoAttributesToUpdate.uuid)
+  } catch (err) {
+    if (videoInstance !== undefined && videoFieldsSave !== undefined) {
+      resetSequelizeInstance(videoInstance, videoFieldsSave)
+    }
+
+    // This is just a debug because we will retry the insert
+    logger.debug('Cannot update the remote video.', err)
+    throw err
+  }
+}
+
+async function removeRemoteVideoRetryWrapper (videoToRemoveData: RemoteVideoRemoveData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ videoToRemoveData, fromPod ],
+    errorMessage: 'Cannot remove the remote video channel with many retries.'
+  }
+
+  await retryTransactionWrapper(removeRemoteVideo, options)
+}
+
+async function removeRemoteVideo (videoToRemoveData: RemoteVideoRemoveData, fromPod: PodInstance) {
+  logger.debug('Removing remote video "%s".', videoToRemoveData.uuid)
+
+  await db.sequelize.transaction(async t => {
+    // We need the instance because we have to remove some other stuffs (thumbnail etc)
+    const videoInstance = await fetchVideoByHostAndUUID(fromPod.host, videoToRemoveData.uuid, t)
+    await videoInstance.destroy({ transaction: t })
+  })
+
+  logger.info('Remote video with uuid %s removed.', videoToRemoveData.uuid)
+}
+
+async function addRemoteVideoAuthorRetryWrapper (authorToCreateData: RemoteVideoAuthorCreateData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ authorToCreateData, fromPod ],
+    errorMessage: 'Cannot insert the remote video author with many retries.'
+  }
+
+  await retryTransactionWrapper(addRemoteVideoAuthor, options)
+}
+
+async function addRemoteVideoAuthor (authorToCreateData: RemoteVideoAuthorCreateData, fromPod: PodInstance) {
+  logger.debug('Adding remote video author "%s".', authorToCreateData.uuid)
+
+  await db.sequelize.transaction(async t => {
+    const authorInDatabase = await db.Author.loadAuthorByPodAndUUID(authorToCreateData.uuid, fromPod.id, t)
+    if (authorInDatabase) throw new Error('Author with UUID ' + authorToCreateData.uuid + ' already exists.')
+
+    const videoAuthorData = {
+      name: authorToCreateData.name,
+      uuid: authorToCreateData.uuid,
+      userId: null, // Not on our pod
+      podId: fromPod.id
+    }
+
+    const author = db.Author.build(videoAuthorData)
+    await author.save({ transaction: t })
+  })
+
+  logger.info('Remote video author with uuid %s inserted.', authorToCreateData.uuid)
+}
+
+async function removeRemoteVideoAuthorRetryWrapper (authorAttributesToRemove: RemoteVideoAuthorRemoveData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ authorAttributesToRemove, fromPod ],
+    errorMessage: 'Cannot remove the remote video author with many retries.'
+  }
+
+  await retryTransactionWrapper(removeRemoteVideoAuthor, options)
+}
+
+async function removeRemoteVideoAuthor (authorAttributesToRemove: RemoteVideoAuthorRemoveData, fromPod: PodInstance) {
+  logger.debug('Removing remote video author "%s".', authorAttributesToRemove.uuid)
+
+  await db.sequelize.transaction(async t => {
+    const videoAuthor = await db.Author.loadAuthorByPodAndUUID(authorAttributesToRemove.uuid, fromPod.id, t)
+    await videoAuthor.destroy({ transaction: t })
+  })
+
+  logger.info('Remote video author with uuid %s removed.', authorAttributesToRemove.uuid)
+}
+
+async function addRemoteVideoChannelRetryWrapper (videoChannelToCreateData: RemoteVideoChannelCreateData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ videoChannelToCreateData, fromPod ],
+    errorMessage: 'Cannot insert the remote video channel with many retries.'
+  }
+
+  await retryTransactionWrapper(addRemoteVideoChannel, options)
+}
+
+async function addRemoteVideoChannel (videoChannelToCreateData: RemoteVideoChannelCreateData, fromPod: PodInstance) {
+  logger.debug('Adding remote video channel "%s".', videoChannelToCreateData.uuid)
+
+  await db.sequelize.transaction(async t => {
+    const videoChannelInDatabase = await db.VideoChannel.loadByUUID(videoChannelToCreateData.uuid)
+    if (videoChannelInDatabase) {
+      throw new Error('Video channel with UUID ' + videoChannelToCreateData.uuid + ' already exists.')
+    }
+
+    const authorUUID = videoChannelToCreateData.ownerUUID
+    const podId = fromPod.id
+
+    const author = await db.Author.loadAuthorByPodAndUUID(authorUUID, podId, t)
+    if (!author) throw new Error('Unknown author UUID' + authorUUID + '.')
+
+    const videoChannelData = {
+      name: videoChannelToCreateData.name,
+      description: videoChannelToCreateData.description,
+      uuid: videoChannelToCreateData.uuid,
+      createdAt: videoChannelToCreateData.createdAt,
+      updatedAt: videoChannelToCreateData.updatedAt,
+      remote: true,
+      authorId: author.id
+    }
+
+    const videoChannel = db.VideoChannel.build(videoChannelData)
+    await videoChannel.save({ transaction: t })
+  })
+
+  logger.info('Remote video channel with uuid %s inserted.', videoChannelToCreateData.uuid)
+}
+
+async function updateRemoteVideoChannelRetryWrapper (videoChannelAttributesToUpdate: RemoteVideoChannelUpdateData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ videoChannelAttributesToUpdate, fromPod ],
+    errorMessage: 'Cannot update the remote video channel with many retries.'
+  }
+
+  await retryTransactionWrapper(updateRemoteVideoChannel, options)
+}
+
+async function updateRemoteVideoChannel (videoChannelAttributesToUpdate: RemoteVideoChannelUpdateData, fromPod: PodInstance) {
+  logger.debug('Updating remote video channel "%s".', videoChannelAttributesToUpdate.uuid)
+
+  await db.sequelize.transaction(async t => {
+    const sequelizeOptions = { transaction: t }
+
+    const videoChannelInstance = await fetchVideoChannelByHostAndUUID(fromPod.host, videoChannelAttributesToUpdate.uuid, t)
+    videoChannelInstance.set('name', videoChannelAttributesToUpdate.name)
+    videoChannelInstance.set('description', videoChannelAttributesToUpdate.description)
+    videoChannelInstance.set('createdAt', videoChannelAttributesToUpdate.createdAt)
+    videoChannelInstance.set('updatedAt', videoChannelAttributesToUpdate.updatedAt)
+
+    await videoChannelInstance.save(sequelizeOptions)
+  })
+
+  logger.info('Remote video channel with uuid %s updated', videoChannelAttributesToUpdate.uuid)
+}
+
+async function removeRemoteVideoChannelRetryWrapper (videoChannelAttributesToRemove: RemoteVideoChannelRemoveData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ videoChannelAttributesToRemove, fromPod ],
+    errorMessage: 'Cannot remove the remote video channel with many retries.'
+  }
+
+  await retryTransactionWrapper(removeRemoteVideoChannel, options)
+}
+
+async function removeRemoteVideoChannel (videoChannelAttributesToRemove: RemoteVideoChannelRemoveData, fromPod: PodInstance) {
+  logger.debug('Removing remote video channel "%s".', videoChannelAttributesToRemove.uuid)
+
+  await db.sequelize.transaction(async t => {
+    const videoChannel = await fetchVideoChannelByHostAndUUID(fromPod.host, videoChannelAttributesToRemove.uuid, t)
+    await videoChannel.destroy({ transaction: t })
+  })
+
+  logger.info('Remote video channel with uuid %s removed.', videoChannelAttributesToRemove.uuid)
+}
+
+async function reportAbuseRemoteVideoRetryWrapper (reportData: RemoteVideoReportAbuseData, fromPod: PodInstance) {
+  const options = {
+    arguments: [ reportData, fromPod ],
+    errorMessage: 'Cannot create remote abuse video with many retries.'
+  }
+
+  await retryTransactionWrapper(reportAbuseRemoteVideo, options)
+}
+
+async function reportAbuseRemoteVideo (reportData: RemoteVideoReportAbuseData, fromPod: PodInstance) {
+  logger.debug('Reporting remote abuse for video %s.', reportData.videoUUID)
+
+  await db.sequelize.transaction(async t => {
+    const videoInstance = await fetchLocalVideoByUUID(reportData.videoUUID, t)
+    const videoAbuseData = {
+      reporterUsername: reportData.reporterUsername,
+      reason: reportData.reportReason,
+      reporterPodId: fromPod.id,
+      videoId: videoInstance.id
+    }
+
+    await db.VideoAbuse.create(videoAbuseData)
+
+  })
+
+  logger.info('Remote abuse for video uuid %s created', reportData.videoUUID)
+}
+
+async function fetchLocalVideoByUUID (id: string, t: Sequelize.Transaction) {
+  try {
+    const video = await db.Video.loadLocalVideoByUUID(id, t)
+
+    if (!video) throw new Error('Video ' + id + ' not found')
+
+    return video
+  } catch (err) {
+    logger.error('Cannot load owned video from id.', { error: err.stack, id })
+    throw err
+  }
+}
+
+async function fetchVideoByHostAndUUID (podHost: string, uuid: string, t: Sequelize.Transaction) {
+  try {
+    const video = await db.Video.loadByHostAndUUID(podHost, uuid, t)
+    if (!video) throw new Error('Video not found')
+
+    return video
+  } catch (err) {
+    logger.error('Cannot load video from host and uuid.', { error: err.stack, podHost, uuid })
+    throw err
+  }
+}